Microcom 438 Operator's Manual page 94

Chapter 5
5.4.2 USB Image Print Mode
^A ^D Command
149 USB Image Print Mode:
This command controls an image print mode protocol that is used with the
USB port to shift images to the printhead at fast baud rates. This mode
requires that the bmp2mic rev 1.02 or later be used to convert the 1 bit
monochrome bitmap image to be printed. This mode basically shifts data
directly to the printhead and does not use the normal LDS command protocol.
This mode also uses additional baud rates for higher speed image printing.
Protocol:
1. The HOST sends a format to the printer that identifies the media
being used:
Example:
This format only needs to be sent one time after the unit has powered
on. The >RESTARTED< status message could be used to indicate
when this needs to be sent or simply send it each time a print is
desired.
2. The Host then sends the printer the ^D149 command followed by the
raw image size that has been converted by the bmp2mic rev 1.02 or
later. Please note that the size is only terminated with a [CR] and the
[LF] is not included.
Example:
3. The printer will report back the image size back to the Host as an
indication that the printer is ready to receive the image.
Example:
4. The host then sends the converted image to the printer.
This image print protocol has a 5 second inter-character timer that starts as
soon as the printer sends back the size of the image. If the 5 second times
out, the download will fail. The printer will report >FAIL TIMEOUT<, the status
light will turn RED, and the printer will not respond to any commands until
receiving the Image mode clear command.
Image Mode Clear command:
ETBYKFNR
or in hex
45 54 42 59 4b 46 4e 52
The protocol will also fail if the image data is larger than the value entered
after the ^D149 command. The printer will report >FAIL SIZE<, the status light
438 Operator's Manual - 880052-0103
^D57[CR][LF]
1,1280,940,,,3,0,1[CR][LF]
^D56[CR][LF]
^D149[CR][LF]size[CR]
size[CR][LF]
Printer Commands
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